Electrolytic condenser



March 20, 1934.

M. BERGSTEIN ELECTROLYTIC CONDENSER Filed May 18, 1931 L k fr Tr E w w 6w W Y MB Patented Mar. 20, 1934 UNITED STATES PATENT OFFICE Micamold Radio a corporation of New York.

Application May 18, 1931, Serial No. 538,399

4 Claims. (Cl. 115-315) The invention relates to condensers of the type wherein a dry electrolytic film is maintained on the surface of armatures or electrodes such as aluminum or magnesium and employing an elec- 6 trolyte in solid or semi-solid form.

I have discovered that soaps are applicable to the above purpose, in combination with saturated or unsaturated soap-forming acid or acids which when added to the soap will adjust its basicity.

10 An ammonium soap has certain advantages over other alkali soaps for the above purpose in that the ammonium radical has a somewhat lower solvent action upon the aluminum oxide surface on the anode.

For example, the electrolyte may be made up by mixing 48 parts of ammonium linoleate, 30 parts stearic acid and 23 parts of oleic acid. to constitute a thick mass which is sufficiently fluid at ordinary temperatures for application without heating, and which is sufliciently solid to be held in position between the condenser armatures or plates, a suitable separator being usually employed.

Other ammonium soap mixtures may be em- 25 ployed with satisfactory results, and the oleic acid may be omitted if desired, in which case the electrolyte should be heated before application. In general the concentration of fatty acids and the ammonium soap chosen, may be varied to obtain varying degrees of consistency and varying characteristics (particularly on aging) of the condensers.

It is unnecessary that the ammonium soap employed be exceptionally pure since the pressure therein of soaps of other fatty acids or free fatty acids or of water, is not ordinarily objectionable, the water adding to the electrolytic conductivity.

For the above reasons commercial grades of ammonium soap aresatisfactory for the purpose.

Inmakingupacondensertheeleotrolytemsy be applied to lighter starched gauze (otherwise untreated) by a stiff knife, while the gauze is upon a raw aluminum cathode. If is rolled condenser is to be formed an aluminum anode, the surface of which has-been oxidized as known in the art, is placed on top of the gauze and electrolyte and covered with another layer of gauze and electrolyte, the whole then being rolled up to complete the condenser.

A preferred form of condenser employing the electrolyte above described is shown in the accompanying drawing wherein Fig. 1 is a perspective view of the condenser partially unrolled, and Fig. 2 is an enlarged cross-sectional view taken through the condenser along the line 2-2 of Fig. 1.

In the drawing, the numeral 1 designates one electrode with its terminal 2. The other electrode is designated by 3 with its terminal shown at 4. Between the electrodes are layers of gauze 5 and 8 impregnated with the electrolyte.

I claim:

1. An electrolytic condenser of the class described having an armature of the film-forming type, and an electrolyte containing an ammonium soap combined with a fatty acid.

2. An electrolytic condenser of the class described having an armature of the film-forming type, and an electrolyte containing an ammonium soap combined with a mixture of fatty acids.

8. An electrolytic condenser of the class described having an armature of the film-forming type, and an electrolyte containing an ammonium linoleate and stearic acid.

4. An electrolytic condenser of the class described having an armature of the film-forming type, and an electrolyte containing an ammonium soap combined with stearlc acid.

)[ILTON BERGB'I'EIN.

CERTlFlCATE 0F CORRECTION.

Patent No. 1,951,720. March 20, 1934.

MILTON BERGSTEIN.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 34, for "pressure" read presence; and line 56, for "lighter" read lightly; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 24th day of April, A. D. 1934.

Br;an M. Battey (Seal) Acting Commissioner of Patents. 

